Accessories

A pair of DUAL-MODE Amplifier models feature voltage mode and current mode operation, designed specifically to enhance the performance of the shakers.

A variety of shaker accessories are offered to provide test application flexibility. These include Auxiliary Tables, Reaction Mass Assemblies, Vertical Mounting kits, an Over-Travel switch, and a High Temperature switch.

APS 4001 - Horizontal Reaction Mass System

Assume you have to identify lateral modal modes of a bridge or building that may be well damped in a frequency range down to 1 Hz or lower. Thus, a modal test by means of an inertial shaker would require passing the full rated exciter force horizontally into the building. An APS 400 long stroke shaker can be equipped with reaction masses for this purpose, but can develop its full force only down to 3.7 Hz.

Below this frequency the maximum force decreases with 12 dB/Octave due to the limited stroke. Increasing the reaction mass significantly can compensate this limitation. The APS 4001 - Horizontal Reaction Mass System provides a means of extending the rated force output for the APS 400 Shaker to frequencies as low as 0.5 Hz.

For this purpose, the system can be equipped with up to 700 kg moving mass. In spite of its high weight, the APS 4001 can be easily dismantled into subassemblies that can be carried by man. Thus, it is still a mobile solution.

Advantages

Horizontal excitation with 400 N rated force from 0.5 Hz ... 20 Hz

Up to 700 kg reaction mass attachable › Easy to disassemble and transport to a test location

Can be equipped with a reference force transducer (option)

Downloads

Based on the 45 years of experience of APS Dynamics, we offer mobile shakers that exhibit their best performance in the low frequency range. Typical applications are modal testing of buildings, bridges and other large structures. Combined with SPEKTRA vibration controllers, complete systems are also available.